Finding the Fourth Proportional to 1,550.30, 2,328.15 and 821.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.30 : 2,328.15 = 821.30 : x
2. Step 2: Convert to fraction form
   1,550.30/2,328.15 = 821.30/x
3. Step 3: Cross multiply
   1,550.30x = 2,328.15 × 821.30
4. Step 4: Simplify right side
   1,550.30x = 1,912,109.60
5. Step 5: Solve for x
   x = 1,912,109.60/1,550.30
6. Step 6: Final answer
   x = 1,233.38